Feeding mechanism for drilling machinery.



PATENTED MAR. 27, 1906.

0. P. PRESLAR. FEEDING MECHANISM FOR DRILLING MACHINERY.

APPLICATION FILED MAR.Z3, 1904.

2 SHEETSSHEET 1.

IIIITIII llllllllll I!" No. 816,500. PATENT ED MAR. 27, 1906.

O. F. PRESLAR. FEEDING MECHANISM FOR DRILLING MACHINERY.

APPLICATION FILED MAR.23, 1904.

2 SHEETS-SHEET 2.

Mimawwew Inwan$011 Kim y i 22% UNITED STATES PATENT FFICE.

CHARLES F. PRESLAR, OF CINCINNATI, OHIO, ASSIGNOR TO THE PRESLAR-CRAWLEY MANUFACTURING COMPANY, OF CINCINNATI, OHIO, A COR- PORATION OFOHIO.

Specification of Letters Patent.

Patented March 27, 1906.

Application filed March 23.1904. Serial No- 199,585.

adapt itself to the various formations as they are encountered bypermitting the drill to descend at a rate proportionate to the rate atwhich the drilling operation may be accomplished within the limits ofsafety, while at the same time supporting so much of the weight of thedrill as is in excess of the amount necessary for successful operation.In mechanism of this class as commonly constructed the drill is usuallyfed downwardly by a positively-operating feeding mechanism by which auniform positive feeding movement is imparted to the drill regardless ofthe character of the soil or other material through which it isoperating. entire weight of the drill rod or member is permitted to restupon the bit at times when the drill is operating. At other times theremay be practically no weight on the bit, and, again, there may bepositive downward pressure in excess of the weight of the drillingtools.These and similar constructions have been found unsatisfactory for thereason that upon encountering hard substances the bit is often mashedover or otherwise injured or twisted entirely off.

The character and scope of my invention will be clearly understood by adescription of one embodiment thereof illustrated in the accompanyingdrawings, in which Figure 1 is a front elevation of the drillingmechanism and carriage therefor, and Fig. 2 is a side elevation thereof.Fig. 3 is a rear elevation of the parts shown in Fig. 1.

In the particular embodiment of my invention herein selected forillustration the drilling mechanism is preferably mounted upon asuitable carriage a, of any desired construction necessary to facilitatetransporta- In other types of machines the tion of said mechanism andthe actuating-engine therefor. The drilling mechanism proper is mountedupon a suitable frame I), which in this case forms a part or the bed ofthe carriage a. The drill-rod proper, c, as shown in Fig. 1, is splinedto the gear-plate d, mounted to rotate upon the frame 1), whereby thedrill may have free longitudinal movement transversely of said gear. Thegear (1 may be actuated in any suitable manner, but, as here shown, ismeshed with an actuating-gear e, mounted upon a short shaft j ournaledat one side of the frame I) and upon which also is mounted a suitablepulley f, which may be driven by means of a belt from theactuatingengine mounted on the carriage above referred to.

The feeding mechanism proper for the drillrod 0 consists of the verticalscrew-threaded standards 9 g, which are securely mounted in any suitablemanner upon the frame I), and adjacent thereto and referably at the rearthereof are the vertica shafts h h, which may be mounted in any suitablemanner, but, as here shown, are journaled in the arms ii and i i, whichproject from the upper and lower ends, respectively, of the standards 99. As will be apparent from an inspection of Fig. 2 of the drawings, thestandards 9 g are arranged slightly out of alinement transversely of thebed I) in order to accommodate the shaft of the driving-gear e. Theshafts h h may be rotated in any desired manner but in the presentconstruction such motion is imparted through bevel-gears j j, secured toa counter-shaft j, which also may be driven by a belt on the pulley 3'Fig. 3, from the engine. The gears j j, as will be seen from Fig. 3, arelocated upon opposite sides of a gear h and are preferably looselysplined on the shaft 7', or, if desired, the shaft may be slidablymounted in its bearings, whereby said gears may be alternately shiftedinto mesh with the gear h by a bell-crank lever and handle 3' pivoted at7' on the machineframe (see Fig. 3) to rotate the shaft h in op- Smsitedirections to lower and raise the drill.

procket-wheels 7c is, connected by a chain serve to produce synchronousmotion of the,

gears r r.

Upon the standards 9 are mounted the 1111-1 threaded sleeves Z Z, whichare provided at or near their lower extremities with flanged hubs Z Z,one of said hubs having an arm Z extending between its standards 9 g andone of the shafts it h. Powerful spiral springs n n of a predetermineddegree of compression are mounted upon the sleeves Z Z between the hubsZ Z and the flanged rings 0 0, which also slidably surround saidsleeves. Upon these rings 0 0 rest the extremities of a guide and feedbar p, through an aperture in which the drill-rod 0 passes and to whichthe weight of said rod is transmitted by means of a collar c, adjustablysecured to the latter, whereby the weight of the bar and the rod istransmitted to the springs n n. Gears m m, fixed to the nuts m m, serveto rotate the latter in a manner hereinafter described. Between hubs Z Zand nuts m m may be any suitable bearing; but no rotary motion istransmitted from nuts m m to hubs.

Upon one of the shafts h above the arm Z is mounted a clutch mechanismof any suitable construction, comprising the members 9 and g, the lowermember (1 of which is connected by a suitable sleeve passing through thearm Z with a gear r and one of the sprocket-wheels Zc, whereby thesethree elementsnamely, the clutch member g, gear 7, and sprocket Zc-aremounted to rotate to gether freely upon the shaft h. To the upper member9 of the clutch is attached a sleeve 8, upon which is coiled a spiralspring t, interposed between said clutch member and the Washer 23, whichis slidably mounted on the sleeve 8. Also slidably mounted upon saidsleeve and resting upon the washer t is an arm it, which is adjustablyconnected in any suitable manner, as by bolt it, with one of the rings0. A second washer t and a stop-ring 'v, fixed to the sleeve 8 above thearm u, serve to hold said arm securely on said sleeve. The clutch member(1 and the sleeve 8 are splined to rotate with the shaft h, but are freeto move longitudinally thereon.

The operation of the mechanism is as follows: With the drill member 0 inposition over the point at which the boring is to be made, rotary motionis imparted thereto by the gear (Z, and at the same time the shaft Zt isalso rotated from. the counter-shaft j. The gear d and shaft j may beoperated from the same or different sources of power and may be arrangedso that one or the other or both may be thrown out of operation bysuitable clutch mechanism, if desired. When the drill is boring throughcomparatively soft material, the rate of work will be proportionatelyrapid, and the feed of the drill to be effective must be at a speed inproportion thereto. In order to provide therefor, the compression of thesprings 11, n is so gaged that any pressure exerted thereupon by theweight of the drill-rod c and the guide in excess of a predeterminedamount will cause the springs an and the rings 0 to be depressed,

6 5 which movement will be transmitted through gears? 1', sprockets Zr,chain Zr, and gears m m to the nuts m m, causing said nuts and attendantparts Z Z, n n, and. 0 0, and conse-' quently the bar 1), supportedthereon, to be fed downwardly upon the threaded supports g g, thuslowering the drill c. On the other hand, when the drill encounters hardsubstances, such as stone and the like, the work of boring will proceedmore slowly and the feed will be proportionately slow. This result isaccomplished by the fact that very slight depression of the springs n 'nwill be sufficient to maintain the drill in effective contact with thesubstances being drilled, and harder strata encountered will have atendency to throw a larger proportion of weight of the drill upon suchsubstances, and thus relieve the springs n n of such weight, whereuponsaid springs will hold the rings 0 0 stationary, while the furtherdownward movement of the nut m, operating through the arm to and bolt uand ring 11, will disconnect the clutch member g from the member g, andthus check further feeding movement automatically.

It is understood that the springs n are to be gaged to carry apredetermined proportion of the weight of the drilling-rod or member c,and the stop-ring 1), together with the arm a and adjustable nuts on u,is also gaged to a predetermined degree in order that any tendency ofthe feed to throw a proportion of the weight of the drill upon thedrilled substance beyond a predetermined factor of safety willautomatically operate to stop the feeding operation.

In order to withdraw the drilling member from the bore, it is onlynecessary to reverse the shaft h.

Many changes may be made in the details and relative arrangement ofparts without departing from the spirit of my invention.

I claim 1. In a feed mechanism for a drilling-machine means to support adrill, a spring carry ing said support and means responsive to thecompression of said spring to vary the rate of feed of said drill.

2. In a feed mechanism for a drilling-machine a support for a drill,springs carrying said support, a feed-actuating member and meansresponsive to variance in pressure of the drill on said support wherebysaid actuating member is moved to operative position.

3. In a feed mechanism for a drilling-machine a support for the drill, astandard carrying said support, a spring mechanism interposed betweensuch standard and said support, and means responsive to the compressionof said spring mechanism whereby said support is fed relatively to saidstandard.

4:. In a feed mechanism for a drilling-machine a yielding drill-supportand means adapted to be thrown into operative position ly 1the yieldingof said support to feed the ri l.

5. In a feed mechanism for a drillingma chine a yielding drill-supportand a clutch adapted to be thrown into operative position gylltheyielding of said support to feed the 6. In a feed mechanism for adrilling-machine a yielding drill-support, feeding means therefor, and aclutch interposed between said support and feeding means adapted to bethrown into operative position by the yielding of said support toactuate said feeding means.

7. In a feed mechanism for a drillingmachine a yielding drillsupport, aclutch member connected therewith, feeding means for said support havinga complemental clutch member, said clutch members being arranged to moveinto operative connection upon yielding of said support.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wit- 30 DBSSGS.

CHARLES F. PRESLAR.

Witnesses:

CHAS. HERBERT JoNEs, JOSEPH R. GARDNER.

